2007 slow throttle response, and rpm stays up

Asked by Jan 07, 2012 at 07:07 PM about the 2007 GMC Sierra 2500HD 2 Dr SLE1 Extended Cab 4WD

Question type: General

I just bought a 2007 2500hd w/6.0 and 6sp allison. It has a cold air intake with throttle spacer and 3" into two 2-1/2 " magnaflow and pipes.The throttle response is not crisp but like stretching a rubber band and the rpm does not come back down quick the motor kinda hangs there. Any suggestions for why.

2 Answers

2,045

sounds like a vacuum leaks or leakin cold air system , check all connections close , oh allison were only in 6.6 diesel and 7.4 gas . you probably have 6L80 trans which is also very good

1 people found this helpful.

Nope sure it is an allison. Have the window sticker. Iwill check for vacum leak.... will this cause the rpm to come down slow also>

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